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Orla Feely - One of the best experts on this subject based on the ideXlab platform.

  • steady state oscillations in resonant electrostatic vibration energy harvesters
    IEEE Transactions on Circuits and Systems I-regular Papers, 2013
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    In this paper, we present a formal analysis and description of the steady-state behavior of an electrostatic vibration energy harvester operating in constant-Charge Mode and using different types of electromechanical transducers. The method predicts parameter values required to start oscillations, allows a study of the dynamics of the transient process, and provides a rigorous description of the system, necessary for further investigation of the related nonlinear phenomena and for the optimisation of converted power. We show how the system can be presented as a nonlinear oscillator and be analysed by the multiple scales method, a type of perturbation technique. We analyse two the most common cases of the transducer geometry and find the amplitude and the phase of steady-state oscillations as functions of parameters. The analytical predictions are shown to be in good agreement with the results obtained by behavioral Modeling.

  • Limit on converted power in resonant electrostatic vibration energy harvesters
    Applied Physics Letters, 2012
    Co-Authors: Elena Blokhina, Peter Harte, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    Based on the formal analysis of a resonant electrostatic vibration energy harvester operating in constant-Charge Mode with a gap-closing transducer, we show that the system displays universal behaviour patterns. In this paper, we treat the harvester as a nonlinear forced oscillator and bound the area of control parameters where the system displays regular harmonic oscillations allowing the conditioning circuit to operate in the most effective Mode. Before the system exhibits irregular behaviour, there exists a universal optimal value of normalised converted power regardless of the system design and control parameters.

  • Bifurcation Scenarios in Electrostatic Vibration Energy Harvesters
    NDES 2012; Nonlinear Dynamics of Electronic Systems, 2012
    Co-Authors: Eoghan O'riordan, Peter Harte, Elena Blokhina, Dimitri Galayko, Orla Feely
    Abstract:

    In this paper, we present numerical bifurcation analysis of an electrostatic vibration energy harvester operating in constant-Charge Mode and using the in-plane gap closing transducer. We show how the system can be represented as a nonlinear oscillator and analysed using methods of nonlinear dynamics. We verify previous analytical theories and explain the behaviour of these energy harvesters, particularly in the regime between the first period doubling bifurcation and chaos.

  • Bifurcations and chaos in electrostatic vibration energy harvesters
    2012
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Rhona Wade, Orla Feely
    Abstract:

    In this paper, we present an analysis of an electrostatic vibration harvester operating in the constant-Charge Mode. The goal of the study is to bound regions of control parameters where the system displays steady-state harmonic oscillations as required for practical use. We show how the system can be presented as a nonlinear oscillator and analysed employing the multiple scales method, Floquet theory and Lyapunov exponents. We determine the conditions for the onset of steady-state oscillations, the period doubling bifurcation and transition to chaos. This allows us to bound regions of control parameters where the system displays desired regular oscillations and, therefore, to identify maximal harvestable power for a particular architecture.

Elena Blokhina - One of the best experts on this subject based on the ideXlab platform.

  • steady state oscillations in resonant electrostatic vibration energy harvesters
    IEEE Transactions on Circuits and Systems I-regular Papers, 2013
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    In this paper, we present a formal analysis and description of the steady-state behavior of an electrostatic vibration energy harvester operating in constant-Charge Mode and using different types of electromechanical transducers. The method predicts parameter values required to start oscillations, allows a study of the dynamics of the transient process, and provides a rigorous description of the system, necessary for further investigation of the related nonlinear phenomena and for the optimisation of converted power. We show how the system can be presented as a nonlinear oscillator and be analysed by the multiple scales method, a type of perturbation technique. We analyse two the most common cases of the transducer geometry and find the amplitude and the phase of steady-state oscillations as functions of parameters. The analytical predictions are shown to be in good agreement with the results obtained by behavioral Modeling.

  • Limit on converted power in resonant electrostatic vibration energy harvesters
    Applied Physics Letters, 2012
    Co-Authors: Elena Blokhina, Peter Harte, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    Based on the formal analysis of a resonant electrostatic vibration energy harvester operating in constant-Charge Mode with a gap-closing transducer, we show that the system displays universal behaviour patterns. In this paper, we treat the harvester as a nonlinear forced oscillator and bound the area of control parameters where the system displays regular harmonic oscillations allowing the conditioning circuit to operate in the most effective Mode. Before the system exhibits irregular behaviour, there exists a universal optimal value of normalised converted power regardless of the system design and control parameters.

  • Bifurcation Scenarios in Electrostatic Vibration Energy Harvesters
    NDES 2012; Nonlinear Dynamics of Electronic Systems, 2012
    Co-Authors: Eoghan O'riordan, Peter Harte, Elena Blokhina, Dimitri Galayko, Orla Feely
    Abstract:

    In this paper, we present numerical bifurcation analysis of an electrostatic vibration energy harvester operating in constant-Charge Mode and using the in-plane gap closing transducer. We show how the system can be represented as a nonlinear oscillator and analysed using methods of nonlinear dynamics. We verify previous analytical theories and explain the behaviour of these energy harvesters, particularly in the regime between the first period doubling bifurcation and chaos.

  • Bifurcations and chaos in electrostatic vibration energy harvesters
    2012
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Rhona Wade, Orla Feely
    Abstract:

    In this paper, we present an analysis of an electrostatic vibration harvester operating in the constant-Charge Mode. The goal of the study is to bound regions of control parameters where the system displays steady-state harmonic oscillations as required for practical use. We show how the system can be presented as a nonlinear oscillator and analysed employing the multiple scales method, Floquet theory and Lyapunov exponents. We determine the conditions for the onset of steady-state oscillations, the period doubling bifurcation and transition to chaos. This allows us to bound regions of control parameters where the system displays desired regular oscillations and, therefore, to identify maximal harvestable power for a particular architecture.

Dimitri Galayko - One of the best experts on this subject based on the ideXlab platform.

  • steady state oscillations in resonant electrostatic vibration energy harvesters
    IEEE Transactions on Circuits and Systems I-regular Papers, 2013
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    In this paper, we present a formal analysis and description of the steady-state behavior of an electrostatic vibration energy harvester operating in constant-Charge Mode and using different types of electromechanical transducers. The method predicts parameter values required to start oscillations, allows a study of the dynamics of the transient process, and provides a rigorous description of the system, necessary for further investigation of the related nonlinear phenomena and for the optimisation of converted power. We show how the system can be presented as a nonlinear oscillator and be analysed by the multiple scales method, a type of perturbation technique. We analyse two the most common cases of the transducer geometry and find the amplitude and the phase of steady-state oscillations as functions of parameters. The analytical predictions are shown to be in good agreement with the results obtained by behavioral Modeling.

  • Limit on converted power in resonant electrostatic vibration energy harvesters
    Applied Physics Letters, 2012
    Co-Authors: Elena Blokhina, Peter Harte, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    Based on the formal analysis of a resonant electrostatic vibration energy harvester operating in constant-Charge Mode with a gap-closing transducer, we show that the system displays universal behaviour patterns. In this paper, we treat the harvester as a nonlinear forced oscillator and bound the area of control parameters where the system displays regular harmonic oscillations allowing the conditioning circuit to operate in the most effective Mode. Before the system exhibits irregular behaviour, there exists a universal optimal value of normalised converted power regardless of the system design and control parameters.

  • Bifurcation Scenarios in Electrostatic Vibration Energy Harvesters
    NDES 2012; Nonlinear Dynamics of Electronic Systems, 2012
    Co-Authors: Eoghan O'riordan, Peter Harte, Elena Blokhina, Dimitri Galayko, Orla Feely
    Abstract:

    In this paper, we present numerical bifurcation analysis of an electrostatic vibration energy harvester operating in constant-Charge Mode and using the in-plane gap closing transducer. We show how the system can be represented as a nonlinear oscillator and analysed using methods of nonlinear dynamics. We verify previous analytical theories and explain the behaviour of these energy harvesters, particularly in the regime between the first period doubling bifurcation and chaos.

  • Bifurcations and chaos in electrostatic vibration energy harvesters
    2012
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Rhona Wade, Orla Feely
    Abstract:

    In this paper, we present an analysis of an electrostatic vibration harvester operating in the constant-Charge Mode. The goal of the study is to bound regions of control parameters where the system displays steady-state harmonic oscillations as required for practical use. We show how the system can be presented as a nonlinear oscillator and analysed employing the multiple scales method, Floquet theory and Lyapunov exponents. We determine the conditions for the onset of steady-state oscillations, the period doubling bifurcation and transition to chaos. This allows us to bound regions of control parameters where the system displays desired regular oscillations and, therefore, to identify maximal harvestable power for a particular architecture.

  • Comprehensive dynamic and stability analysis of electrostatic Vibration Energy Harvester (E-VEH)
    2011
    Co-Authors: Dimitri Galayko, Raphaël Guillemet, Andrii Dudka, Philippe Basset
    Abstract:

    This paper reports on an investigation of dynamic behavior of an electrostatic Vibration Energy Harvester (e-VEH) which uses gap-closing capacitive transducers and operates in a constant-Charge Mode. This work provides a deep insight into stability issues of a e-VEH investigating four dynamic Modes, among which only one corresponds to a regular, stable and desirable operation Mode needed for the energy conversion. The three other Modes represent instable behavior. Each one corresponds to a particular range of external acceleration, and in none of these Modes the e-VEH behaves similarly to an ideal constant-voltage biased transducer associated with a resonator. This paper describes a Modeling experiment allowing a demonstration of the four operation Modes, and proposes theoretical considerations for their quantitative description.

Philippe Basset - One of the best experts on this subject based on the ideXlab platform.

  • steady state oscillations in resonant electrostatic vibration energy harvesters
    IEEE Transactions on Circuits and Systems I-regular Papers, 2013
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    In this paper, we present a formal analysis and description of the steady-state behavior of an electrostatic vibration energy harvester operating in constant-Charge Mode and using different types of electromechanical transducers. The method predicts parameter values required to start oscillations, allows a study of the dynamics of the transient process, and provides a rigorous description of the system, necessary for further investigation of the related nonlinear phenomena and for the optimisation of converted power. We show how the system can be presented as a nonlinear oscillator and be analysed by the multiple scales method, a type of perturbation technique. We analyse two the most common cases of the transducer geometry and find the amplitude and the phase of steady-state oscillations as functions of parameters. The analytical predictions are shown to be in good agreement with the results obtained by behavioral Modeling.

  • Limit on converted power in resonant electrostatic vibration energy harvesters
    Applied Physics Letters, 2012
    Co-Authors: Elena Blokhina, Peter Harte, Dimitri Galayko, Philippe Basset, Orla Feely
    Abstract:

    Based on the formal analysis of a resonant electrostatic vibration energy harvester operating in constant-Charge Mode with a gap-closing transducer, we show that the system displays universal behaviour patterns. In this paper, we treat the harvester as a nonlinear forced oscillator and bound the area of control parameters where the system displays regular harmonic oscillations allowing the conditioning circuit to operate in the most effective Mode. Before the system exhibits irregular behaviour, there exists a universal optimal value of normalised converted power regardless of the system design and control parameters.

  • Bifurcations and chaos in electrostatic vibration energy harvesters
    2012
    Co-Authors: Elena Blokhina, Dimitri Galayko, Philippe Basset, Rhona Wade, Orla Feely
    Abstract:

    In this paper, we present an analysis of an electrostatic vibration harvester operating in the constant-Charge Mode. The goal of the study is to bound regions of control parameters where the system displays steady-state harmonic oscillations as required for practical use. We show how the system can be presented as a nonlinear oscillator and analysed employing the multiple scales method, Floquet theory and Lyapunov exponents. We determine the conditions for the onset of steady-state oscillations, the period doubling bifurcation and transition to chaos. This allows us to bound regions of control parameters where the system displays desired regular oscillations and, therefore, to identify maximal harvestable power for a particular architecture.

  • Comprehensive dynamic and stability analysis of electrostatic Vibration Energy Harvester (E-VEH)
    2011
    Co-Authors: Dimitri Galayko, Raphaël Guillemet, Andrii Dudka, Philippe Basset
    Abstract:

    This paper reports on an investigation of dynamic behavior of an electrostatic Vibration Energy Harvester (e-VEH) which uses gap-closing capacitive transducers and operates in a constant-Charge Mode. This work provides a deep insight into stability issues of a e-VEH investigating four dynamic Modes, among which only one corresponds to a regular, stable and desirable operation Mode needed for the energy conversion. The three other Modes represent instable behavior. Each one corresponds to a particular range of external acceleration, and in none of these Modes the e-VEH behaves similarly to an ideal constant-voltage biased transducer associated with a resonator. This paper describes a Modeling experiment allowing a demonstration of the four operation Modes, and proposes theoretical considerations for their quantitative description.

Tatsuya Kodama - One of the best experts on this subject based on the ideXlab platform.

  • cyclic properties of thermal storage disCharge for al si alloy in vacuum for solar thermochemical fuel production
    Energy Procedia, 2015
    Co-Authors: Nobuyuki Gokon, S Nakamura, Tomoya Yamaguchi, Tatsuya Kodama
    Abstract:

    Abstract Thermal energy storage using phase-change materials (PCM) can be utilizedfor load shaving or peak load shifting when coupled to a solar thermochemical reactor, reformer, or gasifier for the production of solar fuel. The PCM is embedded in packages or used in bulkin these storage systems, and therefore the compatibility of the encapsulation materials and the selection of the PCM arekey factorsfor ensuring the long operational life of the system. Variouskinds of molten fluoride, chloride and carbonate salts,andmixed moltensalt, which functionat high temperatures of over 500 °C, are known to cause corrosion or thermaldegradation. It is therefore worth studying newhigh-temperature PCM thermal storage alternatives to these molten salts foruse in solar thermochemical processes.In this study, the focus was on aluminum-silicon alloy (Al-Si alloy)as a high-temperature PCM thermal storage medium,and thecompatibility of this alloy with graphite-carbon encapsulation material wasexperimentally examined. The cyclic properties of thermal storage/disCharge for Al-Si alloy as a latent-heat energy storage material was studied with respect to various thermal cycles. Athermal stability test was performed for the Al-20wt%Si, Al-25wt%Si, Al-30wt%Si, and Al-35wt%Si alloysplacedin the graphite container in vacuum. The temperatureincreasing and cooling performances of the Al-Si alloy weremeasured duringthe thermal storage (heat-Charge) Mode and during the cooling (heat-disCharge) Mode. Theoxidation levelof the Al-Si alloy after the cyclic reaction (20 cycles) was evaluated using an electron probe microanalyzer (EPMA).